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Helpful answers
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Jan 5, 2015 3:13 PM in response to Dilyseby seventy one,Ideally the Memory should be balanced. It is not absolutely essential but in principal that would mean buying 2 x 8Gb for the two other slots as you propose.
Perhaps you could find a moment to clarify your profile. It is particularly helpful when you ask questions. I am puzzled as to how you have 'just' bought a 27' iMac with Retina yet are using the Lion (OS 10.7.5).
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Jan 5, 2015 4:45 PM in response to Dilyseby babowa,If you have one of the new iMacs where the RAM slots arranged vertically, it's best to match the RAM in slots 1 and 3 (which is most likely the factory RAM) and in slots 2 and 4. There is not need to match all 4 slots.
If the Mac's slots are arranged in two rows of two next to each other, match them horizontally.
In any case, whatever RAM you decide to buy, buy only from a recommended vendor such as OWC (macsales.com) or Crucial, and simply insert your new RAM modules in the two empty slots.
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Jan 5, 2015 4:55 PM in response to Dilyseby Ralph9430,★HelpfulYes, you can add 2 X 8 GB memory modules and end up with a total of 24 GB of RAM. That is exactly what I did with my new iMac 5K. Buy your RAM from high quality sites like Other World Computing or Crucial.

